The first two wave types, P and S, are called body waves because they travel or propagate through the body of Earth. The latter two are called surface waves they the travel along Earth's surface and their amplitude decreases with depth into Earth.
Toysmith Spring Ring Game. Here is a super fun game the kids might like. Nordstrom has this Toysmith Spring Ring Game for $14.98! That is down from the normal price of $24.99, for a 40% savings.
the charms range from $30 for sterling silver or from $50 for silver with stones or from $120 for silver with a little gold (my choice) and from $200 for gold charms. you can also get glass beads which are around $40 i think.